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GET /v1/buffer

Henderson–Hasselbalch buffer

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/phcalc-api

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Code snippets

curl "https://api.oanor.com/phcalc-api/v1/buffer" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/phcalc-api/v1/buffer", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/phcalc-api/v1/buffer");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/phcalc-api/v1/buffer",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "pH": 5.76,
        "pKa": 4.76,
        "pOH": 8.24,
        "mode": "acid_buffer",
        "formula": "pH = pKa + log10([A−]/[HA]).",
        "classification": "acidic",
        "ratio_base_over_acid": 10
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:55.903Z",
        "request_id": "400a1044-abfb-47c6-8c6a-bdb50da724bd"
    },
    "status": "ok",
    "message": "Henderson-Hasselbalch buffer",
    "success": true
}